Add simple healthz

[eriksywu]

Re: #74
I have a use-case to have the lifecycle of autoscaler pods managed by kubelet via liveness checks

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[eriksywu]

I signed it

[eriksywu]

/assign @thockin

[thockin]

Looks much nicer, thanks. Small point, then looks OK, I think.

[thockin]

Justthe spelling.

[eriksywu]

@thockin can you take another look? thnx

[eriksywu]

/assign @MrHohn
hoping to get this merged soon

[MrHohn]

@eriksywu Could you squash the fix-up commits? Thanks.

[eriksywu]

@MrHohn squashed

[thockin]

Thanks!

/lgtm
/approve

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